Update open-webui to latest supported release

apps/open-webui/values.yaml

@@ -6,11 +6,6 @@ strategy:
 workload:
   kind: Deployment
 
-image:
-  # The newest upstream chart currently trails the already-running image.
-  # Remove this tag override when a chart includes Open WebUI 0.12.3 or newer.
-  tag: v0.12.3
-
 ollama:
   enabled: false
 ollamaUrlsFromExtraEnv: true

bootstrap/open-webui.yaml

@@ -10,7 +10,7 @@ spec:
   sources:
     - repoURL: https://helm.openwebui.com
       chart: open-webui
-      targetRevision: 17.0.0
+      targetRevision: 18.3.0
       helm:
         releaseName: open-webui
         valueFiles: